Valve for pneumatic tires.



R. WALMSLEY.

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APPUCANUN FILED HCT M1915.

Patented Jan. 28, 1919.

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invented, certain .new and :usefu lmprovef ments l.in Valves forJ llHneunratio' mires, of which the tellwvingv.is aspeelica'tiolri 'lll'isinvention relates to valves $501 pneumatic Ytires `which serve as .an inlet valve, .a safety'nr relief valve upd a gage to rindicate :th pressure lin'bhe Iliire.

llt consists essentially of en inletvalve so constructed with :a vail've holder or plunger movable aga-inst the ,force of la. spring and fitted with a diaphragm or sleeve of rubber tonake a frictionless air-tght joint to permit the .unrestricted movement thereof to indicate the pressure within the tire `und to open :the valve and allow the air to escape Agli the pressure exceeding a predetermined e 'ee.

ligt will be fully described with reference to :the accompanying drawings.

:igure l en elevation `o the improved valve.

Figi Vis asectional elevation of the valve showing position without Yinternal pressure.

The Neiva is constructed with an outer casing for :cylinder A to Ibe Vattached to the tire in the usuel we and itted therein is a hollow 1l r B w ichcarries the air inlet valve en .iscopableof moving or sliding longitudinally within .the :casing A.

The Casin-gior cylinder A ,is open uit its lower uend tofcon-xmunicate with "the .interior off the pneumatic ltwbe of fthe ltire sothftt vthe air pressure therein nots -against one side of the 'hollow plunger -to :force it outward, a spring C yresting on .e shoulcler .acting to force .it vinward 1n :the `reverse direction. A diaphragm :or rubber uwaeher for rubber sleeve D Vis fitted .between .the plunger B and theeasi Afto renderfthegplunger air-tight withoutriri'ction, `eo :as :to .prevent escape of air-from the Stube'. The diaplnegm is secured to the plunger 2B a mrt d yon `the plunger, :and Lis Yelse `semrrcc'l in any desired manner .to `thelcasing A, :Eornstance by two parts of .thecesi screwed together. The spring C fby Whic the hollow plungerV is controlledl is of such a strength as to resist the maximum :air fpressurerof the 'tire and at `lippeiwend.ebuts .against e shoulder a, on the spring rmay 'be replaced by ve stronger or weaker yone to suit ydiiierert pressures.

The air inlet and relief valve E is fitted pecieation of Letters Patent.

Application ledjoctober 1, 1915.. ASerial No. 53,545.

strnrnsfgirnrnnr oFFIcE.

l cfrnriasn'unr, MANCHESTER, ENGLAND. vencer-on. `rufenmerle TIRES.

Patented Jai-n. 28, 1,919.

into the hollow plunger B with a. valveseat l) on `the lower or inner' end of the plunger and a 4stem or spindle projecting into the interior of the plunger.

The upper end of the cylinder or casing A comprises a cap or cover F screwed thereon `or otherwise attached thereto.

The casing A is provided with a slot c .through which the movement or position of the hollow plunger B therein can be viewed and `it iscalibrated with a. scale in ounds to. indicfiie .the pressure exerted gy the spring ind to show .the internall pressure in the tire.

VThe plunger B is fitted with an index fin-4 er b which moves to and fro with it and 1s visible through the slot a to indicate by its position againstthe scale the internal pressure in the tire.

The end of the 4plunger B extends or projects through the cap or cover F to which the tube of an air pump or compressor may be attached to force air through the lunger and past the air valve E to inflate he tire, the said plunger end being .protected by a rcmovable cap F. To the removable cap Il" a pin `Gr is fitted to enter the upper end of the plunger B and project down into it to- '."ard the stem e of the valve E. The position of the pin G relatively to the stein or spindle of the air valve may be varied either by adjusting the position of the cap or cover F or by adjusting the pin itself independently of said cover. The cover F' and the pin G attached to it arc removed to )ump in air to inflate the tire the pump tu e being screwed onto the upper end of the hollow plunger B.

To prevent dust, water or other foreign matter having zit-cess to or entering through the slot c into the interior of the casing A the slot is covered with a transparent inuterial through which the index finger b can be viewed. A tubo H of glass, mice, or other transparent material is fitted over the exterior' of the casing A and is held in position by the cap F being screwed down tightly upon it, the ends of the tube fitting in grooves or seats in said cap and in the adjacent member of the casing, which seats are provided with suitable packing.

In operation the cap F is removed and the'tire inflated by attaching the air pump or air compressor .to the top end of the hollow plunger B and forcin air in past the valve E. As the pressure increases the holafter which ca low plunger B rises against the resistance o f the spring 'C until the index finger b' indlcates 'that the desired pressure is reached F is replaced, the end o the valve spin e then being also in contact with the fixed pin G. Should the pressure sub uently increase through expansion of the an' or other cause the plunger B rises still farther, whereby said pin'is caused to strike against the valve splndle, thusA prel venting the latter from rising with said plunger and, in conse uence,remov1ng the VWhen the pressure valve E from its seat, a lowing airto escape, and thereby relieving any excess pressure. ecor'nes normal again the lunger B sinks and the device E closes. 1 T e valve thus serves the purposes of -an inlet air valve, a gage and a relief or safety valve for the tire.

What I claim as m invention and desire toXrotect b. Letters atent is valve or pneumatic tires of the type v embodying a casing with a tubular plunger spind e associated therewith and means for automatically opening said valve, combined with an elongated tubular nut having a threaded socket engaging one end of the -plunger and provided with a valve seatin its free end for said release valve, and a flexible diaphragm around-the plunger and secured at the inner portion thereof against said plunger by the end of the threaded socket ofthe nut, the outer portion of the diaphragm being secured between portions of the casing. y I

In testimony whereof I have hereunto set my hand in presence of two subscribing witnoBERT WALMSLEY. Witnesses: i i

T. W. ANDREW. 

